Zapi Chopper SEM-X - General Characteristics; Technical Specifications; Control Units; Microswitches

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2 GENERAL CHARACTERISTICS
2.1 TECHNICAL SPECIFICATIONS
Chopper for Separately Excited DC motors ................................................. 0.35 ÷ 0.8kW
Regenerative Braking
Voltage Range ...................................................................................................... 24VDC
Maximum Field Current (all the versions) .................................................................. 35 A
Armature Switching Frequency ............................................................................... 16kHz
Field Switching Frequency ...................................................................................... 16kHz
Maximum Ambient temperature ............................................................................. + 40°C
Minimum Ambient temperature ................................................................................ -30°C
Maximum temperature of Chopper ......................................................................... + 90°C
VERSIONS MAXIMUM CURRENT
VOLTAGE DROP IN
FULL CONDUCTION
24V 90A (3') 0.14V at 35A, 25°C
24V 110A (2') 0.14V at 35A, 25°C
2.2 CONTROL UNITS
2.2.a Microswitches
- Microswitches should have a contact resistance lower than 0.1Ω, and a leakage
current lower than 100 µA.
- When full load current is being drawn, the voltage drop across the Key Switch con
tact must be lower than 0.1V.
- If an Electromagnetic Brake is used, the Key Microswitch must be able to operate the
Brake Coil.
- The Microswitches send a voltage signal to the microprocessor when an operating
request (running) is made.